An Acura RL 3.5L 6cycl 1997
[i] Code due to Insufficient flow - Is there away of differentiating whether the problem is due to a faulty EGR valve or just dirty ports; (i.e. a way of testing the EGR valve)
[ii] Are there special tools for cleaning these ports ? Seen kits advertised, but dealers do not carry them in their arsenal of parts!
[iii] After cleaning ports and replacing EGR valve if needed does the “Check Engine” light turn off automatically or is there a resetting to be done.